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Hi, I’m Gui Skinner

I’ve been designing some stuff. Mostly products.

I’m a product designer and design engineer, working on growth. I’ve been at it for 16 years, and these days I also write the code, ship it, and look at the numbers to decide what’s next.

I like to work with nice people to solve people’s problems, those who use the product and those who run the business. May I help?

+75%
more enquiries
from one listing-form redesign at TeachMe.To
40+
experiments in the last year
each one with the success metric agreed before launch, including the ones that lost
16 yrs
designing products
Motorola, VivaReal, Mercado Bitcoin’s first app, and now my own products

Well, I’ve done that
on some cool products

Seriously, take a look. These are the four most recent, with the real numbers, including where things didn’t go as planned. Older stuff is further down.

2025 — now

  1. 01

    TeachMe.To

    I take care of conversion for a lessons marketplace in 250+ US cities, from the homepage search all the way to checkout. I design the experiments, build them and read the results.

    • +75% enquiries from one form redesign
    • +25% qualified demand from a rebuilt search
  2. 02

    Helprism

    A help center that updates itself when you ship code. I designed and built the whole thing myself, and it’s about to launch.

    • 7 months first commit to launch-ready
    • 57 agent lanes and I did every merge
  3. 03

    MusicGenius

    Music theory in short drills, with 10 pixel-art games and a sheet music renderer I built from scratch.

    • 23 countries where people learn with it
    • 10 games on a 92-skill curriculum
  4. 04

    Faves

    I redesigned the app’s Pro plan, onboarding and paywalls. Now we also work as a small venture studio, testing ideas with real people before building them.

    • 20+ ideas stress-tested
    • 7 weeks prototype to paid product

How I work

For years I handed off design files. These days I ship the product myself.

AI agents write a lot of the code these days. I’m still the one who talks to users, decides how things look and feel, picks the metric and says what goes live.

ME

Figure out the actual problem behind the request.

AGENTS

Go through interviews, data and competitors much faster than I could alone.

Nothing gets built before the hypothesis is written down.

57agent lanes on Helprism, running at the same time
MEREVIEW
MERGE
DEPLOY
The agents write code, test it and take screenshots, all at once. Merging and deploying is my job.0 merges made by an agent

Things I don’t hand to AI

  • Talking to usersI want to hear it from them myself.
  • The design directionAgents can show me options. I pick one, and I set the rules.
  • What we measureAgreed before launch, so nobody bends the numbers later.
  • What goes liveEvery merge and every deploy goes through me.
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Earlier · 2011—2024

Clearbook · Mercado Bitcoin · Motorola · VivaReal · Meubank · Crediverso · Nowsta · Porto Seguro

Archive coming soon